Vibratory assemblage



Patented Apr. 14, 1953 VIBRATORY ASSEMBLAGE Eugene B. Cook, HalesCorners,1W-is.,. assignorto Allis-Chalmers Manufacturing Company,Milwaukee, Wis., a. corporation of Delaware Application December 22,1949; Serial No. 134,395

12 Claims.

Thisinvention relates to vibratory assemblages, and specifically to avibratory mechanism thereof, inwhich the vibrational. effect is createdby a displacementof one or moreweights. The invention is particularlyadaptedv for embodiment. in gyratory sitters. The principal object, ofthe invention. is to provide new and improved vibratory mechanisms of.these types.

-I-Ieretofore the magnitude of vibration of such mechanisms was variedby either increasing or.

diminishing the eccentricity; of the weights with respect to an axis of.rotation about which they revolved. Considerable diihculty however wasexperienced during the starting or the stopping of the vibrator.;.due toa. critical vibrational frequency occurring-at. certain speeds at whichthe weights: were. rotated. The disturbance therefrom often resulted indamage to the unit,. and hence there arose the need to obviate thisundesirable efiect. It was discovered that by retainingv the weightssubstantially concentric about the. axis of rotation during rotationalspeeds, which. prior to this time produced the critical vibratingfrequencies, the excessive vibrations;couldbeeliminated. One oftheschemes foreflecting the desired result comp-riseda means in whichtheweights were axially displaceable in accordance with theireccentricities with respect tothe axis of rotation. Therefore before theWeights-could assume aneccentric position, a

centrifugal fOrce great enough to overcome. the resistance to axialdisplacement hadto. be imparted to them. This resistancetoaxialdisplacement, was predetermined to. require rotational speedssufiicient to prevent critical vibrating. trequencies. from occurring.when the weights swung into their eccentric operating positions. Theprior'devices of the type hereinabove generally described, were, to thebest of my knowledge, restricted to. one fixed magnitude of vibration ata given speed of rotation, and therefore the vibratoryunitwasnecessarily oriented inthe assemblage to uniformly distribute thevibrations. Hencewhen itwas desirable to vary the magnitude of vibrationfor different kinds of material beingiprocessed; the weight system hadtobe reoriented or' other major changes made in the vibratory-mechanismto. assure uniform distributionv oi the vibrations. It is thereforeanother object of: the invention to} provide means for accomplishing thehereinabove stated. function in a simple and emcienti manner.

.A' morespecific objectof the invention-isv to provide positivemeans formaintaining the mass centerzof the weights in line-with the center ofgravity oftheassemblage-atvarious magnitudes of vibration.

Other objectswillappear hereinafter as the description of theinvention-proceeds.

i The novel features of. theinventionfiandhow the objects areattainedwill appear from this specification and the accompanying drawing forminga part. of this application. and all these novel featuresareintended tobe pointed out-in the claims.

In the drawings: Fig. 1. isv a side elevational viewofa vibratoryassemblage embodying the invention;

Fig. 2; isan enlarged elevational view partly in Fig. 4. is a. sectionalview taken along-line IV-IV of Fig. 2; and.

Fig. 5 is a sectional view taken: along lineV -V of Fig. 2.

-Referring to'Fig. 1 the assemblage generally comprises 'a'vibratorymechanism oriented-as herein shown symmetrically between aplurality ofmaterial receiving units '1. A lower frame 8 and: upper. frame. 9rigidly-join the. units 1; and provide a carryingmeans-for the vibratorymechanism. The" entire assemblage may be-ireely suspended from anoverhead structure (not. shown) by reedsll, or -resiliently-su-pportedbysprings,v rubberblocks or other: suitable means permitting treevibratory mo-tion thereof.

A' rotatableshaft I2 is iournaled for rotation inqoversi-zed sphericalbearings i3 of 1 the seli-- aligning type. carriedina lower bearingshousing 141 and. an upper bearing; housing. t5 respectively secured tothe lowenframe' 8 and-upper frame 9. The rotatable shaft-. 12 may be:drivenby a belt and motor. (not show-me or: other siu'tablerdrivingmeans from either endybut'the shaft 1:2"18 herein shown as: having; aportion; ll: extending through the lower. bearing. housing: M5, .theportion I H being adapted: to have a; beltrpulleyl (not: shown) mounted.thereonpr 1 to. be driven 1 through a coupling. tnotrshowh) orrinany'aothersurn m way;

Eccentrica'lly disposed to. the rotatable shaft lZ-isa pair of parallelshafts I 8 having axes diatev bracket .211: and; lower--and upperbrackets 22,. 23'. respectively. Eachofi.thebrackets is prm vided withthree cylindrical holes, for respectively receiving the rotatable shaftI2 and the parallel shafts I8. Set screws may be threaded through therespective brackets radially to each of the cylindrical holes for fixingeach bracket securely to the rotatable shaft I2 and the pair of parallelshafts I8. The bracket 20 appears in Fig. 3, and set screws 24 forfastening the bracket 20 to one of the shafts [8 are visible.

A pair of flyweights 25 is swingably carried about the parallel shaftsl3 by carrying arms 2? extending from opposite ends of the fiyweights.The carrying arms 2'? are formed with bores at their free ends toslidably receive respective portions of the parallel shafts I8 betweenthe end brackets l9 and lower and upper brackets 22, 23, respectively.Extendin from a point substantially midway between the ends of eachflyweight 25 is a follower arm 28 provided with a cylindrical bore 29radial to the axes of the parallel shafts I8 for rotatably receiving theshank 3| of a follower 32. Referring to Fig. it is seen that thefollower arms 28 are also adapted to receive adjustable bolts 33 whichwill radially strike the rotatable shaft l2 when the centrifugal forceimparted to the flyweights 25 is decreased below a critical point.

Pivotal about the axis of, and carried by the parallel shafts I 8, is apair of cams 34 axially supported by the intermediate bracket 29 asclearly illustrated in Fig. 3. Integralwith each cam 34 islan arm,herein shown as a bifurcated arm 35, for receiving a cam engaging bar31. A plurality of holes 38 are formed in the bar 31 to receive bolts 39passing through the furcations of the arm 35, for adjusting the pivotalposition of. the

cams 34. A guide path is formed in each cam 34, commencing at its lowerend as a helix 40 and merging into a longitudinal surface 42approximately midway the length of the cam. The guide path surfaceconforms to engage the surface of the follower 32, which is herein shownas a frusto-comcal surface, but which may be cylindrical or of any othersuitable shape.

To assure equal displacement of the followers 32 along the guide path ofthe cams 34, thefiyweights 25 are constructed to swing in unison.

To this end coacting meshing gear segments 43 are secured to therespective fiyweights 25, as here shown on the lower carrying arms 21.

Preparatory to operating the vibratory mechanism at its maximumefficiency, various adjust-.

ments are necessary. To facilitate the ease in making the adjustments, apair of axiallyadjustable bolts 44 are threaded through the upperbracket 23. By turning the bolts 44 in one direction to press upon theupper carrying arms 27, the fly-weights 25 can be raised to relievetheir weight from the cams 34. The earns 34 may now be axially moved toa point on the parallel shafts I8, that will limit the upward axialmotion of the flyweights 25 when in operative position, to where the.mass center of the flyweights will be coincident with the center ofgravity of the material receiving units 1,'as hereinafter more fullydescribed. Obviously the intermediate bracket 20 which supports the cams34 must be brought into abutting relationship therewith and secured tothe rotatable and parallel shafts I2, I 8, respectively, to preventdownward axial slippage of the cams.

when secured together by the cam engaging bar 31, will determine, asherein previously stated, the magnitude of vibration, by limiting theangular positions of the flyweights 25 with respect to the The pivotalpositions of thecams 34,

axes of the parallel shafts I8 when the vibrator is in operation.Therefore, with the cam engaging bar 31 removed the cams 34 are free topivot about the parallel shafts I8, and hence may be rigidly resecuredin any one of several pivotal positions by means of the bolts 39 passedthrough the bifurcated arm 35 and the selected pair of holes 38 in thecam engaging bar. With the cams 34 thus adjusted, the pair of axiallyadjustable bolts 44 may now be turned in the op-- posite direction topermit the fiyweights 25 to rest entirely upon the guide path of thecams 34 by means of the followers 32.

The operation of the vibratory assemblage is as follows. As therotatable shaft [2 begin to rotate, the fiyweights 25 will remain intheir substantial concentric relation to the axis of rotation, until thecentrifugal force transmitted to them is great enough to overcome theresistance imposed upon the followers 32 by the helical guide path 40 ofthe cams 34. With an increase'in rotational speed beyond the hereinaforesaid condition, the axial displacement of the fiyweight 25 islimited by the contact engagement of the followers 32 with thelongitudinal surface 42. .The angular displacement of the followers islimited 34. axes of the followers 32 coincide with an imaginary line onthe guide path of the cam 34, as

defined by the mergence of the helix 40 with the longitudinal surface42, the flyweights 25 will be? restrained from further displacement atany nori mal operating speed, due to the resistance offered by thelongitudinal surface; It is therefore evil dent that with the properprior axial adjustment. of the cams 34, the mass center of thefiyweights 25 will be in line with the center of gravity of the materialreceiving units 1 at any predeter--- mined operative angulardisplacement of the fly-- Weights. Hence the displacement of theflyweights 25 is axially limited by the longitudinal surface 42 of thecams 34, for any one of a series of magnitudes of vibration.

Fig. 3 clearly shows that with any of the permissible pivotal positionsof the cams 34, thethe flyweights 25- axial limited displacement of willremain constant. 7

From the foregoing it will be apparent to those skilled in the art thatthe illustrated embodiment of the invention provides new and improvedvibratory assemblages and accordingly, accomplishes the objects of theinvention. On' the other hand, it will be obvious to those skilled in.the art, that the illustrated embodiment of'the invention may bevariously changed and modi-. fied, or features thereof, singly orcollectively, embodied in other combinations than that illusl trated,without departing from the spirit of the invention, or sacrificing allof the advantages i thereof, and that accordingly the disclosure hereinis illustrative only, and the invention is not limited thereto.

It is claimed anddesired to secure bylletters Patent 1. A vibratoryassembly, comprisingv a frame,

a shaft journaled for rotation in said frame,

weights carried by said shaft and swingably dis-- posed about axeseccentric to the axis of rotation of said shaft, said weights beingangularly and axially displaceable with respect to said eccentric axes,cams pivotal about said eccentric axes, and.

followers secured to said weights and engageable in guide portions ofsaid cams for limitingsaid axial displacement of said weights atvariable predetermined operative angularrdisplacements. thereof.

2. A vibratory assembly, comprisingla frame,.a

shaft journaled for rotation in said frame, a pair'- cams pivotal aboutsaid parallel axes, said cams beings engageable with said followers forlimiting said angular and said axial displacements of said weights.

3. A vibratory assembly, comprising a frame, a shaft journaled forrotation in said frame, a. pair of parallel shafts spaced eccentricallyto said rotatable shaft, a pair of weights, means for car-- rying saidweights on said parallel shafts in angular and axial displaceablerelationship thereto, a pair of cams pivotally secured respectively tosaid parallel shafts, followers secured to said weights and extendingradially to said parallel shafts, said followers engageable with saidcams for limiting said axial displacement of said weights atpredetermined angular displacement thereof, and intermeshing gearsegments secured to said weights for effecting dependent angulardisplacements of said weights.

4. A vibratory assembly, comprising a frame, a shaft journaled forrotation in said frame, a pair of parallel shafts spaced eccentricallyto and carried by; said rotatable shaft, a pair of weights provided withcarrying arms extending from opposite ends of said weights, saidcarrying arms being slidably receivable on said parallel shafts forallowing angular and axial displacement of said weights, followersextending radially from said weights intermediate said carrying arms tosaid parallel shafts, a pair of cams pivotally carried by said parallelshafts, and engageable with said followers, means for angularlyadjusting said cams for determining said angular displacement of saidweights and simultaneously limiting said axial displacement to a fixedpoint, and intermeshing gear segments secured to said weights foreffecting dependent angular displacements of said weights.

5. A vibratory assembly comprising: a frame; a, main shaft journaled forrotation in said frame; first and second parallel secondary shaftscarried by said main shaft and spaced eccentrically thereto; first andsecond weights; means for carrying said first and second weightsrespectively on said first and second secondary shafts in angular andaxial displaceable relation thereto; first and second cams respectivelyangularly adjustable relative to said first and second secondary shafts;a follower secured to each of said weights and extending toward saidsecondary shafts, said followers being respectively engageable with saidfirst and second cams for limiting said axial displacement of said firstand second weights respectively at predetermined angular displacementsthereof; and first and second intermeshing gear segments respectivelysecured to said first and second weights for effecting dependent angulardisplacements thereof.

6. A vibratory assembly comprising: a frame; a main shaft journaled forrotation in said frame; first and second parallel secondary shaftsspaced eccentrically to said main shaft and carried thereby; first andsecond weights provided with carrying arms extending from opposite endsthereof, said carrying arms of said first and second weights beingrespectively slidably disposed on said first and: secondhsecondaryshafts I -for allowing angular and axialdisplacementof said weights;first and secondfollowers extending respectively from said first and.second weights.

intermediate said carrying arms toward said first and second secondaryshafts; first. and-"secondcams angularly adiustably carried respectivelyby saidfirst and second: secondary shaftszand" engageable respectivelywith said first and second 1 followers; .means for angularly adjustingsaid cams for determining said angular displacement of said weights andsimultaneously limiting said axial displacementof said weights to apredetermined position, and firstands'econd -intermesh ing gear segmentsrespectivelyssecured tosaid first and second weights for effectingdependent angular displacement thereof.

7. Avibratory assembly comprising 1. a frame; a main shaft journaled forrotation in-said" frame; first and second secondary'shafts carried bysaid main shaftv and spaced parallel thereto;

first and second cams respectively carried y brate said assemblyat apredetermined ampli-- tude in accordancewith said angularly adjustedposition of said cams, and 'bein limited to -a 1 predetermined axialdisplacement for any said angularly adjusted position of said cams; andintermeshing gear segments secured to said weights for effectingdependent radial displacement thereof.

8. A vibratory assembly comprising: a frame; a main shaft journaled forrotation in said frame; first and second secondary shafts carried bysaid main shaft and spaced parallel thereto; first and second camsrespectively carried y said first and second secondary shafts; commonmeans for interconnecting said cams in angularly adjusted positionrelative to said main shaft; first and second weights oppositelyswingably disposed on said first and second secondary shaftsrespectively and radially and axially displaceable relative to said mainshaft; first and second followers respectively extending from said firstand second Weights and respectively engaging said first and second cams;said first and second followers coactin respectively with said first andsecond cams for limiting said weights in said radial displacement inaccordance with said angularly adjusted position of said cams to imparta predetermined amplitude of vibration to said assembly, and limitingsaid weights to a predetermined axial displacement relative to said mainshaft for any said angularly adjusted position of said cams; andintermeshing gear segments secured to said weights for effectingdependent radial displacement thereof.

9. A vibratory assembly comprising: a frame; a main shaft journaled forrotation in said frame; first and second secondary shafts carried bysaid main shaft and spaced parallel thereto; first and second weightsoppositely swingably disposed on said first and second secondary shaftsrespectively in radial and axially displaceable relation relative tosaid main shaft; intermeshing gear segments secured to said weights foreffecting dependent radial displaceaesgcre-w ment thereof; first andsecond cams respectively carried by said first and second shafts; commonmeans for interconnecting said cams in angularly adjusted position;follows respectively extended from said first and second weights incoacting engagement with said first and second cams for limiting saidweights in said radial displacement to impart a predetermined amplitudeof vibration to said assembly in accordance with said angularly adjustedposition of said cams; and adjustable supportin means for axiallypositioning said cams to a predetermined point for axially limiting saidWeights to said predetermined point for any said angularly adjustedposition of said cams.

,10. A vibratory assembly comprising: a frame; a main shaft journaledfor rotation in said frame; a secondary shaft carried by and spacedeocentrically to said main shaft; at least one weight swingably'carriedby said secondary shaft in radially and axially displaceabl relationwith'respect to said main shaft; at least one cam carried by saidsecondary shaft for engagement with said Weight for resisting saidradial displacement of said weight When said main shaft is rotated, saidcam being angularly adjustable with respect to said secondary shaft forlimiting said radial displacement of said weight to a predeterminedposition corresponding to the adjusted angular position of said cam.

' 11. A vibratory assembly comprising: a frame;

a shaft journaled for rotation in said frame;

weights carried by said shaft, said weights being swingably disposedabout respective axes spaced parallel to said shaftin radially andaxially displaceable relation with respect to said shaft; I

cams carried by said shaft in engagement with said weights forrespectively resisting said radial displacements of said weights whensaid shaft is rotated, said cams respectively being angularly adjustableabout said axes for limitin said radial displacements of said weights topredetermined positions corresponding to the adjusted angular positionsof said cams.

12. A vibratory assembly comprising: a frame; a main shaft journaled forrotation in said frame; at least one secondary shaft carried by saidmain shaft and spaced parallel thereto; a cam secured to said secondaryshaft and an-' gularly adjustable to predetermined positions relativethereto; a weight in engagement with said cam and swingably disposed onsaid secondary shaft in radially and axially displaceable relation withrespect to said main shaft, said cam being formed to resist radialdisplacem nt of said weight when said shaft is rotated and to limit saidradial displacement to predetermined positions corresponding to theadjusted angular positions of said cam.

EUGENE B. COOK.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,383,676 Thompson July 5, 1921 2,192,420 Stroud Mar. 5, 19402,479,682 Heberbrand Aug. 23, 1949

